Process of producing pinacone.



f STATES PATENT o FFIoE.

AUGUST JONAS AND EDUARD T SCHUNKUR, OF LEVERKUSEN, NEAR COLOGNE, GER- MANY, ASSIGNORS T0 FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., 0F ELIBER- FELD, GERMANY A CORPORATION OF GERMANY.

PROCESS OP PRODUCING PINACONE.

.No Drawing.

Patented July 29, 1913.

To all whom it may concern: I

Be it known that we, AUGUST J oNAs. and EDUARI) T soHUNKUR, doctors ofphilosophy, chemists, citizens, respectively, of the GermanEmpire and the Empire of Russia, residing at Leverkusen, near Cologne, Germany, have invented new and useful Improvements in Processes of Producing Pinacone, of which the following is a specification.

The present invention relates to a new and valuable process for producing a pinacone from a ketone such as acetone, which process consists in treating ketones with aluminium amalgam with or Without the addition of agentspromoting the reaction, such as iodin, chlorin or its compounds such as chloroform,bromoform, C01,, Cl,-C-C- C1,, chloral, chloralhydrate, SbCI etc.

The aluminium amal am can be used already formed; or meta lic aluminium in a finely divided form and mercuric chlorid can be used, the aluminium becoming amalgamated on the surface only by this process.

In order to illustrate the new process more fully the following example is 'ven, the parts being by weight :In a vesse provided with a reflux condenser and a stirrer 50 parts of aluminium powder or shavings, 500 parts ofacetone and 10 parts of mercuric chlorid are heated to boiling during one hour. Subsequently in the course of 10 hours a solution of 20 parts of mercuric chlorid in 500 parts of acetone is added to the mixture drop by drop. Boiling is then continued for two hours. When the reac tion is complete the organo-aluminium compound is decomposed by the addition of water, the mixture is heated to boiling, the precipitate is removed by filtration, acetone isdistill'ed ofi and the pinacone is preclprtated from the remaining mass as its hydrate by the addition of water.

The foregoing process can advantageously be carried out in the presence of a nonreactive diluent, such as benzene, toluene,

etc., and when such a diluent is used less acetone is necessary than when the process is carried out in the absenceof such a diluent, and by thus avoiding an excess of acetone in the reaction, the formation of undesirable by-products is prevented' We claim 4 1. Process of producing a pinacone from a ,ketone which comprises treating such ketone with aluminium amalgam to form an organo-aluminium compound, and decomposing the resulting organo-aluminium compound, substantially asdescribed.

2. Process of producing a pinacone from a ketone which comprises treating such ketone with aluminium amalgam in the presence of an agent promoting the reaction to form an organo-aluminium compound, and decomposing the resulting organo-aluminium compound, substantially as described.

3. Process of producing pinacone from acetone which comprises treating acetone 'with aluminium amalgam to form an or gano-aluminium compound, and decomposmg the resulting organo-aluminium com pound, substantially as described.

4. Process of producing pinacone from acetone which comprises treating acetone with aluminium amalgam in the presence of an agent promoting the reaction to form an organo-aluminium compound, and decomposing the resulting organo-aluminium compound, substantially as described.

5. Process of producing a pinacone from a ketone which comprises treating such ketone with mercuric chlorid and metallic aluminium to form an organo-aluminium compound, and decomposing the resulting organo-aluminium compound, substantially as described.

6. Process of producing a pinacone from a ketone which comprises treating such ketone with mercuric 'chlorid and metallic alualuminium compound, and decomposing the resulting organo-aluminium compound, substantially as described.

7. Process of producing pinaconefrom acetone which comprises treating acetone with mercuric chlorid and metallic aluminium to form an organo-aluminium compound, and decomposing the resultin organo-aluminium compound, substantiafiy as described.

8. Process of producing pinacone from acetone which comprises treating acetone with mercuric ChlOI'ld. and metallic aluminium in the presence of an agent promoting the reaction to form an organo-aluminium compound, and decomposing the resulting set our hands in the presence of two sub- 15 scribing witnesses.

AUGUST JONAS. 1,. 8.] EDUARD TSCHUNKUR. 1 8.]

Witnesses:

CHAS. J. WRIGHT, vL. Numn. 

